Rotary wing construction



United States Patent [72] Inventor Paolo Orazl Via S. Fiorano 1, Brescia, Italy [21] Appl. No. 704,835 22 Filed F eb. 12,1968 r Continuation of Ser. No. 599,480, Dec. 6, 1966, abandoned [45] Patented Nov. 17, 19 70 [54] ROTARY WING CONSTRUCTION 2 Claims, 3 Drawing Figs. [52] 11.8. CI 244/39, I70/I60.5, 244/19 [51] Int. Cl B64c 27/02 [50] Field ofSearch 244/8-10, 16,19-21, 39; 170/1605 5 6] References Cited UNITED STATES PATENTS 991,331 5/1911 Lawrence 170/1605 1,766,472 6/1930 Wander. 244/10 1,816,898 Few 244/19 1,975,116 10/1934 McIntyre... 244/19 2,176,185 10/1939 Nelson 244/9 FOREIGN PATENTS 7,745 3/1909 Great Britain. 170/1605 420,897 12/1910 France 170/1605 Primary Examiner-Milton Buchler Assistant Examiner-Steven W. Weinrieb ABSTRACT: A rotary wing assembly for aircraft has a wing and extending on ROTARY WING CONSTRUCTION This application is a continuation of application Ser. No. 599,480 filed Dec. 6, 1966 now abandoned.

This invention concerns improvements in or relating to airspar and ribs to provide a flying surface, the sheet means being reduced compared to-onehaving such sheets applied to both sides thereof. However owing to the arrangement shown, in

which the sheets 3 are arranged on opposite surfaces of the arranged to cover one surface only of the ribs, and sheet means extending on opposite sides of the span axis 'b'eing respectively located on opposite surfaces of the ribs, with reference to the plane of the wing. The design is such, to enhance the performance of said wing.

The invention is illustrated by way of example in the accompanying drawing, in which:

FlG. l is a sectional elevation of a wing assembly rotatable about its span axis, 7

FIG. 2 is a plan view of an aircraft with a wing assembly as shown in HO. I mounted thereon, and

HO. 3 isa side elevation of the aircraft shownin FIG. 2. Referring to the drawing, the wing assembly comprises a framework comprising a central tubular spar 1 having diametrically opposed apertures through which extend transverse ribs 2. The flying surfaces of the wing are defined by two longitudinally extending sheets 3, each ofwhich is attached to the spar l and ribs 2 on one side of the wing only, by means of wing.

The provision of sheets 3 only on one side of the wing is a wing with reference to the plane thereof, the ribs 2 are not subject to air pressure and serve to assist rotation of the wing.

- Moreover the arrangement of the wing relatively to the aircraft fuselage, as shown in the drawing, is such that during this rotation the sheet 'is maintained in position against the ribs by airpressure.

For example if at the right hand side of the wing as viewed in H6. 1, the sheet 3 were located above the wing instead of below it, the sheet 3 would be torn off the ribs and off the spar in a direction opposite to that of the rotation of the wing.

In the structure according to the invention, however, the air pressure adds to the strength of the structure.

' 1 claim:

l. A rotary wing assembly for an aircraft, including a wing mounted on-an aircraft fuselage for rotationabout its span axis, said wing consisting of a central spar extending spanwise, a plurality of transverse ribs attached symmetrically to said spar extending through said spar to both sides thereof and spaced along the spar inia common-plane, and sheet means extending over the framework of spar and ribs to provide a flying surface, the sheet means being arranged to cover the'leading surface only of the ribs, and said sheet means extending on opposite sides of the span axis being respectively located on opposite surfaces of the ribs, with reference to the plane of the wing.

the sheet meansat the free extremities of'saicl ribs are angled in opposite directions with reference to the plane of the wing.

2. An assembly as claimed in claim], in which the edges of 

